Improvement in wood pavements



UNITED STATES OPATENT OFFICE.

RIGHARDH. wILLET, on WASHINGTON, DISTRICT or COLUMBIA.

IMPROVEMENT IN WOOD PAVEMENTS.

Specieation forming part of Letters Patent No. 114,895, dated May 16,'1871.

To all whom t may concern:

Be it known that l, RICHARD H. WILLET, of the city and county ofWashington, and District of Columbia, have invented certain new anduseful Improvements in Wooden l a perspective view of one ofthe blocks.

The nature of my invention consists in making the blocks wider at themiddle than at the ends, so that when embedded upon a layer of sand fora foundation, and having a concrete composed of asphalt or tar and sandbetween them, they will form a double wedge of the filling, which willprevent the blocks either being pressed down by weight upon them orbeing forced upward from any power from below.

In the drawing, Fig. l, A represents the blocks; B, the sand foundation;C, the concrete between the blocks; l), the level surface of theroadway.

Construction. After the proper preparation of the roadbed a suitablethickness of sand is to be spread evenly upon the same, and, the estab'-lished crowning ofthe cross-section completed, the blocks are to besetup as represented in Fig. 1, so that about one-half an inch may be keptbetween them at their widest section at a, but close together across theroad-bed. As the courses are set up the concrete, ready prepared, shouldbe poured between, and, thus uniting them when cold, will form a doublewedge, having the smallest part in the middle.

-It will be evident, from inspection of the drawing, that there can beno possible chance for the blocks to be moved after the mass of concreteshall have become firmly compacted, and, if they shall have beenproperlysettled and prepared, no downward movement can result.

Having thus explained my invention, what I claim as new therein, anddesire to secure by Letters Patent ot' the United States, is-

The blocks A, formed of' a double wedge shape, with the widest part atthe iniddle, to be embedded in a concrete composed of sand and asphaltor tar, andplaced upon a foundation of sand, substantially as and forthe purpose described.

RICHARD H. WILLET.

